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To be without some of the things you want is an indispensable part of happiness.
PAC学习框架提供了一种形式化的方法来量化概念类的可学习性。
In chemistry, as in life, the most transformative reactions often occur at the boundaries between disciplines.
The ocean is not just a resource; it's our responsibility to protect it for future generations.
Music is the light in the darkness.